<!DOCTYPE html>
<html>
<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<!-- This file documents the use of the GNU compilers.

Copyright © 1988-2023 Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with the
Invariant Sections being "Funding Free Software", the Front-Cover
Texts being (a) (see below), and with the Back-Cover Texts being (b)
(see below).  A copy of the license is included in the section entitled
"GNU Free Documentation License".

(a) The FSF's Front-Cover Text is:

A GNU Manual

(b) The FSF's Back-Cover Text is:

You have freedom to copy and modify this GNU Manual, like GNU
     software.  Copies published by the Free Software Foundation raise
     funds for GNU development. -->
<title>Architecture implementation (Using the GNU Compiler Collection (GCC))</title>

<meta name="description" content="Architecture implementation (Using the GNU Compiler Collection (GCC))">
<meta name="keywords" content="Architecture implementation (Using the GNU Compiler Collection (GCC))">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<meta name="viewport" content="width=device-width,initial-scale=1">

<link href="index.html" rel="start" title="Top">
<link href="Indices.html" rel="index" title="Indices">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="C-Implementation.html" rel="up" title="C Implementation">
<link href="Locale_002dspecific-behavior-implementation.html" rel="next" title="Locale-specific behavior implementation">
<link href="Library-functions-implementation.html" rel="prev" title="Library functions implementation">
<style type="text/css">
<!--
a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em}
kbd.key {font-style: normal}
span:hover a.copiable-link {visibility: visible}
ul.mark-bullet {list-style-type: disc}
-->
</style>


</head>

<body lang="en_US">
<div class="section-level-extent" id="Architecture-implementation">
<div class="nav-panel">
<p>
Next: <a href="Locale_002dspecific-behavior-implementation.html" accesskey="n" rel="next">Locale-Specific Behavior</a>, Previous: <a href="Library-functions-implementation.html" accesskey="p" rel="prev">Library Functions</a>, Up: <a href="C-Implementation.html" accesskey="u" rel="up">C Implementation-Defined Behavior</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<h3 class="section" id="Architecture"><span>4.15 Architecture<a class="copiable-link" href="#Architecture"> &para;</a></span></h3>

<ul class="itemize mark-bullet">
<li><cite class="cite">The values or expressions assigned to the macros specified in the
headers <code class="code">&lt;float.h&gt;</code>, <code class="code">&lt;limits.h&gt;</code>, and <code class="code">&lt;stdint.h&gt;</code>
(C90, C99 and C11 5.2.4.2, C99 7.18.2, C99 7.18.3, C11 7.20.2, C11 7.20.3).</cite>

<p>Determined by ABI.
</p>
</li><li><cite class="cite">The result of attempting to indirectly access an object with
automatic or thread storage duration from a thread other than the one
with which it is associated (C11 6.2.4).</cite>

<p>Such accesses are supported, subject to the same requirements for
synchronization for concurrent accesses as for concurrent accesses to
any object.
</p>
</li><li><cite class="cite">The number, order, and encoding of bytes in any object
(when not explicitly specified in this International Standard) (C99
and C11 6.2.6.1).</cite>

<p>Determined by ABI.
</p>
</li><li><cite class="cite">Whether any extended alignments are supported and the contexts
in which they are supported (C11 6.2.8).</cite>

<p>Extended alignments up to <em class="math">2^{28}</em> (bytes) are supported for
objects of automatic storage duration.  Alignments supported for
objects of static and thread storage duration are determined by the
ABI.
</p>
</li><li><cite class="cite">Valid alignment values other than those returned by an _Alignof
expression for fundamental types, if any (C11 6.2.8).</cite>

<p>Valid alignments are powers of 2 up to and including <em class="math">2^{28}</em>.
</p>
</li><li><cite class="cite">The value of the result of the <code class="code">sizeof</code> and <code class="code">_Alignof</code>
operators (C90 6.3.3.4, C99 and C11 6.5.3.4).</cite>

<p>Determined by ABI.
</p>
</li></ul>

</div>



</body>
</html>
